[PATCH] Send IN_ATTRIB events when link count changes

[Jan Kara <jack@suse.cz>]

  Hi Andrew,

  would you pick up this patch for testing in -mm? Thanks.

								Honza

-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR

---

Send inotify events to the inode itself when its link count has changed.

Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Morten Welinder <mwelinder@gmail.com>

diff --git a/fs/namei.c b/fs/namei.c
index 3b993db..9a91130 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2188,6 +2188,7 @@ int vfs_unlink(struct inode *dir, struct
 
 	/* We don't d_delete() NFS sillyrenamed files--they still exist. */
 	if (!error && !(dentry->d_flags & DCACHE_NFSFS_RENAMED)) {
+		fsnotify_link_count(dentry->d_inode);
 		d_delete(dentry);
 	}
 
@@ -2360,7 +2361,7 @@ int vfs_link(struct dentry *old_dentry,
 	error = dir->i_op->link(old_dentry, dir, new_dentry);
 	mutex_unlock(&old_dentry->d_inode->i_mutex);
 	if (!error)
-		fsnotify_create(dir, new_dentry);
+		fsnotify_link(dir, new_dentry);
 	return error;
 }
 
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 2bd31fa..b21b818 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -92,6 +92,14 @@ static inline void fsnotify_inoderemove(
 }
 
 /*
+ * fsnotify_link_count - inode's link count changed
+ */
+static inline void fsnotify_link_count(struct inode *inode)
+{
+	inotify_inode_queue_event(inode, IN_ATTRIB, 0, NULL, NULL);
+}
+
+/*
  * fsnotify_create - 'name' was linked in
  */
 static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
@@ -103,6 +111,18 @@ static inline void fsnotify_create(struc
 }
 
 /*
+ * fsnotify_link - new hardlink in 'inode' directory
+ */
+static inline void fsnotify_link(struct inode *inode, struct dentry *new_dentry)
+{
+	inode_dir_notify(inode, DN_CREATE);
+	inotify_inode_queue_event(inode, IN_CREATE, 0, new_dentry->d_name.name,
+				  new_dentry->d_inode);
+	fsnotify_link_count(new_dentry->d_inode);
+	audit_inode_child(new_dentry->d_name.name, new_dentry, inode);
+}
+
+/*
  * fsnotify_mkdir - directory 'name' was created
  */
 static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)